In the old days... (Score 1)

This reminds me of the ones we used to make out of beer cans, back when they were made out of steel and we were full of bad ideas.

We'd take six or seven of those cut out the top and bottom, stack them using duck tape with a final can at the bottom with half the top taken out and a small hole at the bottom. Tennis balls were the amunition of choice and lighter fluid the propellant.

I remember balls going for a couple of hundred feet into the air... ah the good old days.